xxvi North American Trees 



11. Leaves remotely and finely serrate; lateral buds several, super- 

 posed; fruit a drupe FORESTIERA, p. 357. 



III. LEAVES ALTERNATE AND COMPOUND 



1 . Fruit a legume ; leaves 1 to many pinnate 



LEGUMINOSAE (key to), p. 267. 



1 . Fruit not a legume 2 



2. Leaves persistent; fruit a small drupe 3 



2. Leaves deciduous 4 



3. Leaflets spatulate, H inch long; Texas PISTAGIA, p. 309. 



3. Leaflets lanceolate, 2-3 inches long; southeastern coastal plain. . 

 SAPINDUS MARGINATUS, p. 313. 



4. Twigs armed with spines 5 



4. Twigs unarmed 6 



5. Leaves doubly pinnate; fruit a berry ARALIA, p. 323. 



5. Leaves once pinnate ; fruit a capsule . ZANTHOXYLUM, p. 285. 



6. Leaves doubly pinnate ; fruit a drupe 7 



6. Leaves once pinnate 8 



7. Leaflets 1-2 inches long; drupe yellow, V^-M inches 



MELI A, p. 287. 



7. Leaflets V4 inch long; drupe red, 14 inch long 



BURSERA, p. 287. 



8, Leaves 3-foliate ; fruit a winged samara .... PTELEA, p. 285. 



8. Leaves 5 to many foliate 9 



9. Pith conspicuously chambered; fruit a nutlike drupe with an 

 indehiscent husk JUGLANS, p. 134. 



9. Pith solid ; fruit not as above 10 



10. Leaves IV^— 4 feet long; leaflets with glands on coarse teeth; 

 fruit a samara with twisted wing AILANTHUS, p. 287. 



10. Leaves smaller or leaflets without glands 11 



1 1 . Stipules or stipular scars present ; leaflets sharply serrate ; buds 



resinous; fruit a pome SORBUS, p. 249. 



1 1 . Stipules absent ; buds not resinous ; fruit not a pome 12 



12. Leaflets entire; fruit a yellow berry. . . .SAPINDUS, p. 313. 



12. Leaflets toothed (rarely entire in Rhus) 13 



13. Buds large; fruit a nutlike drupe GARYA, p. 138. 



13. Buds small; fruit berry-like or capsular 14 



14. Juice milky; fruit a berry-like drupe RHUS, p. 289. 



14. Juice watery; fruit a capsule; southwestern 



UNGNADIA, p. 313. 



IV. LEAVES ALTERNATE, SIMPLE, AND PERSISTENT 



1 . Leaves lobed 2 



1. Leaves entire or toothed 4 



2. Leaves Yi-Vi inch long; fruit a long-tipped achene: South- 

 west COWANIA, p. 258. 



